Hello, I want to do a research project on letters from soldiers of ww1, and I need a lot of them. I need letters from soldiers who are British, French, German, Italian, Russian and it would be great to find some Turkish, Hungarian, Serbian and Greek letters.

So, do you know of any good books which have a lot of letters (preferably translated) from a specific nation? or any good reliable source I can draw from?

Thanks in advance.